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ORA-04063 table has errors

Hello,
I'm new to oracle and have problems with it....
I don't know when it happened, but i have problems with the main instance of my database wich is being terminated and then restarted every 4-5 minutes.
In the log files there is :

The user QS and his tables belong to the tablespace EXAMPLE wich is installed with ORACLE. I tried to delete the table, the user, the tablespace.... none of these is possible : each time i get the message "End of file on communication pipe" or so error (i don't know the correct translation of the french message : fin de fichier sur le canal de communication).